diff --git a/GNUmakefile b/GNUmakefile
index daf28e7..3b0016b 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -1,30 +1,30 @@
-IS_ =
+TARGET =
 
-ifeq ($(IS_),)
-	IS_ = $(shell uname -s)
+ifeq ($(TARGET),)
+	TARGET = $(shell uname -s)
 endif
 
 ### Platforms
-ifeq ($(IS_),Linux)
-	IS_ = 1
+ifeq ($(TARGET),Linux)
+	IS_UNIX = 1
 endif
 
-ifeq ($(IS_),NetBSD)
-	IS_ = 1
+ifeq ($(TARGET),NetBSD)
+	IS_UNIX = 1
 endif
 
-ifeq ($(IS_),Windows)
-	MINGW = 1
-	IS_ = 1
+ifeq ($(TARGET),Windows)
+	IS_MINGW = 1
+	IS_UNIX = 1
 endif
 
-ifeq ($(IS_),Watcom)
-	IS_ = 1
-	IS_ = 1
+ifeq ($(TARGET),Watcom)
+	IS_WATCOM = 1
+	IS_UNIX = 1
 endif
 
 ### Stuff
-ifeq ($(IS_),1)
+ifeq ($(IS_UNIX),1)
 	CC = gcc
 	CFLAGS = -c
 	LDFLAGS =
@@ -33,11 +33,11 @@ ifeq ($(IS_),1)
 	EXE =
 endif
 
-ifeq ($(IS_),1)
+ifeq ($(IS_WINDOWS),1)
 	EXE = .exe
 endif
 
-ifeq ($(IS_),1)
+ifeq ($(IS_WATCOM),1)
 	CC = owcc
 	CFLAGS = -c
 	LDFLAGS =
@@ -48,13 +48,17 @@ ifeq ($(IS_),1)
 	endif
 endif
 
-ifeq ($(MINGW),1)
+ifeq ($(IS_MINGW),1)
 	CC = gcc
 	CFLAGS = -c
 	LDFLAGS =
 	LIBS =
 endif
 
+ifeq ($(IS_MUSL_CROSS),1)
+	CC = musl-$(CC)
+endif
+
 ### Common flags
 CFLAGS += -Iexternal/duktape -Iexternal/stb
 
diff --git a/Jenkinsfile b/Jenkinsfile
index 9dc6a7c..89b58be 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -11,7 +11,7 @@ pipeline {
 					}
 					steps {
 						sh("make clean")
-						sh("make -j4 ")
+						sh("make -j4 IS_MUSL_CROSS=1")
 						sh("mv pmake pmake-linux64")
 						archiveArtifacts("pmake-linux64")
 					}